The ecotonal zone was created by psammolittoral, emerged macrophytes in eulittoral and littoral, and submerged vegetation in littoral. Immigration of typical plankton species of Rotifera to the psammon communities occured. The highest density of rotifers was found in psammolittoral zone, lower in littoral and the lowest in eulittoral zone. The highest biodiversity was found in eulittoral and littoral zones of lakes with well-developed pond type phytolittoral.
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